DD149552A5 - AUTOMATIC NEEDLE SELECTION MECHANISM FOR A KNITTING MACHINE - Google Patents

Abstract

The invention relates to a selection mechanism for knitting machines whose knitting needles are actuated by selectors or brought into knitting position. By the invention, a direct transmission of the video signals to the electromagnets for the corresponding needle selection is possible in a relatively simple manner, wherein the invention is characterized by small dimensions of the selection mechanism. The essence of the invention is that for each selector 4, an electromagnet 14 is arranged on a relative to the selectors movable mounting plate 13, wherein the mounting plate is brought closer to the Selektorbett 1 and the electromagnets 14 are optionally energized and then the mounting plate from Selektorbett is moved away while only those selectors are moved from a first to a second position corresponding to the respective energized magnet 14 and in a further movement of the selector bed 1 in the direction Laengsrichtung the selectors 4 certain pins are actuated.

Description

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Automatic needle selection mechanism for a knitting machine

the invention:

The invention relates to an automatic Nadelwählmechanismus for a knitting machine according to the preamble of the main claim.

Characteristic of the known techn. Solutions: In conventional hand knitting machines and weft knitting machines, the adjustment of the needle arrangement for the respective, special knitting pattern has hitherto been effected mechanically by punched cards. The manual production of these punch cards according to the pattern drawings required a lot of time and cost.

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Recently, machines are available which produce punched cards for video signals obtained by photoelectrically scanning a pattern drawing. In this way, improvements were made in the accuracy and the working speed. However, if the knitting pattern is to be changed, the complete stack of cards still needs to be replaced. In addition, it is difficult to partially modify a pattern.

The present invention seeks to eliminate the above-mentioned drawbacks by using the video signals, directly or via a magnetic tape, to actuate electromagnets which select particular selectors and so for a particular arrangement of the knitting needles However, there are various difficulties in producing a specific machine.

First, the width of the smallest available electromagnets is much greater than the distance between selectors in a knitting machine. This is typically 1.5 to 2.0 mm. A simple arrangement of the electromagnet e in a row is thus not possible because there is not enough space for this.

Second, since the electromagnets are fixed, it is extremely difficult to attract only the desired selectors by activating certain electromagnets.

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There is a certain probability that adjacent selectors will be attracted by magnetic leaks, leading to malfunction.

Thirdly, if it is thought to attract the selectors, which correspond to needles to be used by electromagnets, then a very large number of electromagnets must be energized. Consequently, the power consumption becomes significant, especially when the electromagnets have to be energized during the entire knitting process of the series.

Object of the invention:

The object of the present invention is to provide an automatic Nadelwählmechanismus in which a direct conversion of video signals od .. the like. On electromagnets is practically possible.

le ^ un ^ des _i Essence of the invention;

This object is achieved by the invention / characteristics of the main claim described; advantageous developments are specified in the dependent claims. ÄusführimA'gbeisnicle:

An embodiment of the invention will be explained in more detail with reference to the drawing; show it:

Pig. Figure 1 is a partially broken perspective view of the knitting machine showing the selector mechanism;

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Pig. 2 is a cross section through the in Pig. 1 machine, parallel to the longitudinal direction of the ITadelselektoren and perpendicular to the mounting plate, the selectors are shown in their reset state;

Pig. 3 is a view similar to the pig. 2 · _? however, in which the selectors are shown in their extended state;

Pig. Figure 4 is a similar view showing the puncture mode in needle selection;

Pig. 5 i. View in which a modification of the machine and 6 after the Pig. 1-4, with the needles in the extended and retracted states respectively.

First of all, the Pig. 1 to 4 of the drawings. In Pig. 1 is a perspective view of a partial view of a knitting machine. A number of slots 2, which are perpendicular and arranged side by side, are milled in an upper, projecting rib at the front of a vertically arranged selector bed i. On the lower front surface of this selector bed

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is also a laterally extending tip "or a step 3 formed"

Reference numerals 4a, 4b, 4c, 4d ... designate selectors, each of which is in the form of an elongated rod which is perpendicular. At the front part of each selector, there is formed a projection 5a, 5b, 5c facing forward. These projections are located on adjacent selectors at different heights. In the illustrated embodiment, the staggered height pattern of the projections repeated on four selectors, as can be seen from the drawing.

The upper section of each selector is slidably inserted in a slot 2 formed in the selector bed 1. At the lower part of the rear surface of each selector 4, a step 6 is formed. This step 6 abuts against the selector bed 1 by resting freely on the step. The lower end of each selector is further supported by a horizontal support 7 which does not move and extends below the lower edge of the selector bed 1.

On both sides of the selector bed 1, the ends of arms 8, which vertically move the selector bed 1, are secured by means of trunnions and slits in the arms. The front end of each arm 8 is fixed to a lateral axis 9. At a suitable location of the axle 9, a downwardly extending lever 10 is attached,

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which is acted upon in the forward direction by a spring 11. The reference numeral 12 denotes a stop for the lever

A movable mounting plate 13 is disposed in front of the selector bed 1, substantially parallel thereto. Pivot pins 4-1 extending out from both sides of the upper band of the mounting plate are pivotally supported by the arms. On the rear surface of the movable mounting plate 13, a number of electromagnets 14 is mounted. Each electromagnet faces a corresponding projection 5 of a selector 4-. There is an electromagnet for each selector. The electromagnets are thus arranged at different heights, for example at 14-a, 14-b, 14-c and 14-d, corresponding to the different heights of the projections 5a, 5c, 5c and $ d . In this way, all the electromagnets in the space available on the movable mounting plate 13 can be fitted, although the electromagnets are wider than the distance between the selectors.

At the center of the front surface of the mounting plate 13, a lever 15 is fixed, which extends forward and then down. A push rod 16 protrudes from the lower part of the front surface of the lever 15 to the front. The lever 15 is pressed by a tension spring 17 to the front.

The reference numeral 19 denotes a connecting rod, which is pivotally supported in the middle by a pivot pin 20. It is seen in a clockwise direction, in Fig. 1 from above,

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by a tension spring 21 "acted upon, which has a greater restoring force than the spring 17".

A slot 22, which is formed in the left end of the connecting rod, is engaged with a pin 23 "protruding from the front upper surface of the push rod 16. A similar slot 24 is formed in the right-hand end of the connecting rod 19 and engages with a pin 26 which protrudes from the middle upper surface of a push rod 25. This extends forward and backward of the lower end of the lever 10 and serves to raise the selector bed 1. A horizontal roller 27 articulated to the front end of the push rod 25 contacts a cam 28 which is horizontal in front of the roller 27 rotates.

In the above-explained mechanism, when the roller 27 is in the deepest recess of the cam 28 as shown in Fig. 1, the push rod 25 and the lever 10 are moved away from each other. The selector bed 1 occupies its lowest position as shown in FIG.

In addition, the movable mounting plate 13 is moved against the restoring force of the spring 17 to the rear, since the push rod 16 is displaced from the connecting rod 19. All of the electromagnets 14 are in a position near the corresponding projection 15 of the corresponding selector 4.

Then, those electromagnets which are connected to selectors of knitting needles not required for the tricking operation are selectively energized in accordance with video signals. These video signals are obtained by scanning a pattern drawing photoelectrically. The energized electromagnets attract their selectors. In the drawing, the electromagnets 14c are shown energized as they attract the selectors 4c. Of course, any combination can be selected according to the desired knit pattern.

When the cam 28 twists, moves as in Pig. 3, under the pressure of the cam 28, the push rod 25 »until it begins to push the lower end of the lever 10. At the same time tilts the mounting plate 13, which is connected via the connecting rod 19 with the push rod 25 to the pivot pin 41 away from the selectors forward.

As a result, those selectors attracted to the selector bed 1 by the energized electromagnets (electromagnets 14c in the drawing) are pulled out. Their steps 6 at the lower parts are led away from the step 3 on the lower hand of the selector bed 1. Then the electromagnets are deactivated. As the cam 28 continues to rotate, the roller 27 passes over a crest of the cam 28. The push rod 25 advances the lever 10 so that the selector bed 1 together with the selector of the selectors. lifted by their electromagnets are not raised. In this way, the knitting needles (not shown in the drawing, but above the selectors

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located) in the knitting ready position. This is in Pig. 4- shown.

When the cam 28 continues to rotate until the roller 27 returns to the recess of the cam 28, the movable mounting plate 13 simultaneously moves backward while the selector bed 1 is lowered; becomes. The shifted selectors are returned to their original positions in the selector bed 1, pushed by their electromagnets e 14 and finally take their original positions, as in Pig. 2 again.

As a modification of the construction described above, instead of the carrier 7i as in Pig. 5, a pivot plate 31 can be seen. This has an L-shaped cross section and is on the machine frame (which is not shown) articulated by a horizontal pin 32. The lower ends of the selectors 4 are thereby supported by the horizontally extending piece 33 of the plate 31 free. A leaf spring 34 with inverted V ~ Porm is attached to the front edge of the horizontal piece 33. A pressure piece 35 hangs down from the lower edge of the mounting plate 13 in a manner that it pushes the leaf spring 34 downwards, when the mounting plate 32 moves backwards- In this way, the pivot plate 31 is inclined in the clockwise direction, whereby the vertical piece 36 of the pivot plate 31 is moved forward. Thus, all selectors are moved slightly forward to the electromagnet, causing the Eontakt

between the selectors "and the electromagnet becomes more reliable.

Thus, according to the above description, the electromagnets are arranged side by side, staggered relative to one another, such that as many electromagnets as selectors can be mounted on a single mounting plate even though the electromagnets are much wider than the distance between the selectors.

In addition, because the mounting plate of the electromagnets move toward and away from the selector bed, the solenoids only need to attract selectors when they are very close. In this way small electromagnets can be used. This improves needle selection as there is no risk of magnetic Lec flux attracting adjacent selectors.

In addition, because the mounting plate moves, only electromagnets corresponding to unused selectors must be bestrojated, but not those corresponding to selectors that operate needles used for knitting. In this way, the number of electromagnets that must be energized is considerably reduced. In addition, they need not be energized throughout the entire knitting of the series, but only as long as the selectors that are not in use are moved so that they are no longer in engagement with the selector bed 1.

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Of course, in other embodiments, the mechanism, which is made up of compression cams 28, etc., and which serves to move the mounting plate and the selector bed, may be different. In addition, the exact details of the arrangement of projections on the selectors and the electromagnets are not important as long as the electromagnets are staggered relative to each other and can be accommodated in the available space on the mounting plate. They can not do that if they are all mounted in a row.

Claims (3)

21 9 614 claim for invention: An automatic needle selection mechanism for a knitting machine "in which a plurality of knitting needles are actuated by a plurality of knitting needle selectors" arranged in parallel, side by side and slidably engaged in a selector bed which extends longitudinally of the needle selectors for actuation 21 9 614 reciprocating the needles, wherein each selector is movable in the lateral direction between a first position in which it undergoes the movement of the selector bed and a second position in which it does not undergo the movement of the selector bed, characterized in that it comprises: an electromagnet (14) for each selector (4) a movable mounting plate (13) on which the electromagnets (14) are mounted and which faces the selector bed (1) and faces the selector bed (1) moving this path so that all of the electromagnets (14) can be brought close to the corresponding selector (4) when in the first position, whereby when all the selectors (4) are in their first position, in which they are subject to the movement of the Selektorbettes (1), and the mounting plate (13) is first brought to the Selektorbett (1) and then the electromagnets (14) optionally energized and then the mounting plate (13) is moved away from the selector bed (1), only those selectors (4) are moved from their first positions to the second positions where they are separated from the selector bed, which is the energized electromagnet (14). , whereby a subsequent movement of the selector bed (1) in the longitudinal direction of the needle selector (4) only actuates certain needles and produces a desired knitting pattern. 9 614 2. Nadelwählmechanismus according to item 1, characterized in that the electromagnets (14 ·) are arranged staggered on the mounting plate (13) against each other. The needle - selecting mechanism according to item 1 or 2, characterized in that it comprises a pushing mechanism which transmits pressure exerted by the mounting plate (13) as it approaches the selector bed (1) so that the selector (4) of the selector slightly touches the corresponding electromagnet (14) is moved to. For this purpose, drawings